The wonders of technology. Today, you can measure the oxygen saturation in your blood by the use of a handy, non-invasive instrument that can be carried around with ease. The finger pulse oximeter is a battery-operated device that monitors a person's blood oxygen saturation and pulse rate. It is very helpful to persons with cardiopulmonary diseases. The device is slipped into the finger of the patient. After several seconds, the data is displayed on the LCD screen. It is easy to use, affordable, fast and accurate.